.zoom {
    -webkit-animation: zoom 1s ease-in infinite;
    animation: zoom 1s ease-in infinite;
}

@-webkit-keyframes zoom {
    0% {transform: scale(0.9);}
    50% {transform: scale(0.85);}
    100% {transform: scale(0.9);}
}

@keyframes zoom {
    0% {transform: scale(0.9);}
    50% {transform: scale(0.85);}
    100% {transform: scale(0.9);}
}

.zoom-orig {
    -webkit-animation: zoom-orig 1s ease-in infinite;
    animation: zoom-orig 1s ease-in infinite;
}

@-webkit-keyframes zoom-orig {
    0% {transform: scale(1);}
    50% {transform: scale(0.9);}
    100% {transform: scale(1);}
}

@keyframes zoom-orig {
    0% {transform: scale(1);}
    50% {transform: scale(0.98);}
    100% {transform: scale(1);}
}